CVE-2026-40687

CriticalCVSS 9.1/10Last modified Jun 17, 2026

Description

In Exim before 4.99.2, when the SPA authentication driver is used with an adversarial SPA resource, there can be an out-of-bounds write that crashes the connection instance, or erroneous data processing that divulges data from uninitialized heap memory.

Metrics

CVSS 3.1 9.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Weakness enumeration

CWE-909

Affected software

No affected versions have been published.

Timeline

Published: Apr 30, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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